[jira] Reopened: (HADOOP-1581) HBASE: Un-openable tablename bug

["Jim Kellerman (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-1581?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jim Kellerman reopened HADOOP-1581:
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Rather than extracting the table name from the region name, why not get it from the HRegionInfo since it contains the HTableDescriptor which has the name of the table in it?

static Text getRegionName(HRegionInfo info) {
  return info.getTableDesc().getName();
}

or is it the case that all you have is the region name and not the HRegionInfo?



> HBASE: Un-openable tablename bug
> --------------------------------
>
>                 Key: HADOOP-1581
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1581
>             Project: Hadoop
>          Issue Type: Bug
>          Components: contrib/hbase
>    Affects Versions: 0.14.0
>            Reporter: James Kennedy
>            Priority: Critical
>         Attachments: hadoop-1581-2.patch, hadoop-1581-v3.patch, hadoop-1581.patch
>
>
> If you create a table whose name is the beginning of an already existing table name, you will not be able to open the table.
> Try:
> 1) Create table TESTOne
> 2) Create table TEST
> 3) Open table TEST
> The reason is that the the META keys augment the table name with _[regionID].  So when looking up table TEST, a scanner is opened on the HMemCache Meta region with a start key of "TEST".  But the HMemcacheScanner backingMaps (TreeMaps) are keyed with the augmented table names where TESTOne_[regionid1] comes before TEST_[regionid2] because 'O' is lower than _ in the ASCII table.  The backingMaps[i].tailMap(firstKey).keySet().iterator() line in HMemCache returns an iterator starting from TestOne_... and not Test_... like it should.  
> The "if(!regionInfo.tableDesc.getName().equals(tableName)) {"  line in HClient will cause the method to stop searching for more regions of that table and the number of found tables for tableName will be 0.  Incidentally that IF statement will report "table found" even when that is not the case.

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